Gkietding-mill



E. HARRISON.

F GrindngMiILv Patented June 6, 1854.

Akin

` EDWARD HARRISON, E NEW HAVEN, CONNECTICUT.

. GEINDING-MILL.

Specification forming part of Letters Patent No.

To all whom t may concern Be it known that I, EDWARD HARRISON, of the city and county of New Haven, in the State Vof Connecticut, have invented sundry new and useful Improvements in Grinding- `Mills; and I do hereby declare that the fol- Y lowing isa full and `exact description thereof, reference being had to the accompanying drawings, making a part of this specification. M

Figure l is a vertical `section through the center of one of my improved grinding mills; Fig. 2, abottom view of the mill; Fig. 3, a bottom view of the shoe and a portion of the hopper, detached; and Fig. 4, a view of the top of the shaft.

Similar letters indicate like partsiny all the figures.

I construct my improved grinding mill wholly of stone and metal, and in the strongest and most compact manner. Matched casings A and B receive the stationary grinding stone E, and the ruimer F, D, W. The stationary stone E, is ce' mented and firmly secured within the upper casing A; and the runner is rigidly secured to shaft C, and `rotates freely within the lower casing B. The lower casing B, has three hollow columns I-I, descending from its under side, upon which the mill rests; which columns are connected to each other at their lower ends by the three arm base I, Sao., as shown in Fig.` 2. Three standards M, M', &c., rise from the upper casing A, and support the hopper K, sockets J, J, J, being cast upon the under side of the hopper which receive into them theupper ends `of the said standards, as shown in Figs. l and 3. The shoe L, is supported andvibrated in the following manner, viz A smooth vertical hole is formed in the rear end of the Shoe, which receives the standard M, as shown in Fig. l. A slot 71. is formed in the under side of the shoe, which receives into it a pivot i, that rises from an eccentric position on` the. top of the shaft- C. Consequently, it will be perceived that the rotation of the shaft, will impart the requisite vibrationto the shoe. The discharge of the grain from the hopper into the shoe, is governed by varying the size of its discharging aperture T, by means of the sliding gate t. The grain falls from the open end of the shoe into the open mouth of the aperture U, in the upper casing, and thence it passes into the inclined passage V, in the upper 11,040, dated `June 6, 1854; Ressued. November No. 625.

stone, which conducts it into the eye of the i same. The instant that the grain falls upon the center of the runner, it is'thrown outward by centrifugal force between the grinding surfaces of the runner and th'estationary stone; which enablesthe highest sa-fel velocity to be given to the runner, without the possibility of the accumulation of grain within the eye of the stationary stone.

V The runner is formed of a unitedmetallic back (D) and hub (W) combined with a disk face composed of therequisite quantity and quality stone. The said back and hub of the runner, maybe formed of soft metal,

Vand. be `cast upon theV back and within the eye `ofa prepared stone;` or be formed of' i cast iron, and the stone face be fitted and cemented to the back and around the hub of the same. A band c, closely embraces and unites the peripheries of the metallic back and the stone face of the runner; and as the stone face wears away, the band is driven down and projects below the under side of the said back. The shaft C, is provided `with three bearings, viz: One in the. center of each of the upper and lower casings A and B, and the step Gr, at its lower end. The hub-like outwardprojections A and B, from the centers of the casings A and B, which receive the shaft C, should be cast of such a shape as to enable'them to receive bushings, or bearing surfaces, of Babbitt metal. j

I give to the shaft C, a vertically elastic and an adjustable bearing, by means of the following arrangement of parts; viz: The step Gr, of the shaft, passes down through a hole in the center of the base I, &c., and has a screw cut upon its periphery which is embraced by the supporting and adjusting nut N. To the under side of the respective arms I, &c., of the base, there are secured the springs g, g, g, by means of the sustaining and adjusting screw bolts f, f, f, which pass up through the said arms of the base and are arranged as shown in Figs. l and 2. On the inner end of each spring g,

a rod c, rests and rises through a hole in thepense.

vented from turning with the nut N, by`

' so rigidly and securely confined to the shaft,

that when placed in a metallic supporting frame the stationary stone and the runner can be truly and accurately faced by grinding them together., Third, a large sized runner can with perfect safety be rigidly confined to a Shaft, provided the shaft be ol' suflicient strength, and the hub be of suiiicient height. f.

vI am aware that a disk faced running mill stone has been supplied with a metallic back and eye, when the said runner has been suspended upon a bail and the grain fed through the eye of the same; and I am also aware that a -small sized running mill stone-without a metallic back and eye-has been yrigidly secured to its spindle; and therefore, I do not claim either of the said arrangements as my invention: But

lhat I do claim as new and desire to sey cure by Letters Patent, is

An improvement in the grinding mill produced by forming the runner of a metallic back and hub combined with a disk grinding face composed of the requisite quantityy and quality of stone, and, rigiding securing the shaft within the metallic hub of the runner, when the said runner is arranged and operates with the stationary uppermost stone substantially as herein set forth.

The above specification of my improvement in grinding mills signed and witnessed this 27th day of January, 1858. v

EDWARD HARRISON.

Witnesses:

Z. C. ROBBINs, J. S. BROWN.

[FIRST PRINTEDl 1913.]

. r y ISLA A 

